Math, asked by DivyeshUpadhyay, 11 months ago

if x = 9-4√5
find:- x-1/x

Answers

Answered by harshitha006
4
x=9-4root5
1/x =1/9-4root5 × 9+4root5/9+4root5
9+4root5/(9)^2 -(4root5) ^2
9+4root5/81-80
9+4root5
1/x=9+4root5
x-1/x
9-4root5 -(9+4root5)
9-4root5-9-4root5
-4root5-4root5
-8root5 is answer obtained
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